W inifred J. Marquart is an American billionaire heiress to the SC Johnson family fortune. She is one of the four children of the late Samuel Curtis Johnson Jr. and the great-great-granddaughter of the company's founder, Samuel Curtis Johnson Sr., who started the business in 1886 as a parquet flooring company. The company has since grown into a massive, privately held global giant in the consumer packaged goods industry, famous for its household cleaning and chemical products.

SC Johnson is the company behind a vast portfolio of iconic household brands, including Pledge furniture polish, Glade air fresheners, Raid insect killer, and Ziploc food storage bags. The company remains under the firm control of the Johnson family. Winifred, along with her three siblings—H. Fisk Johnson (the company's current chairman and CEO), Helen Johnson-Leipold, and S. Curtis Johnson III—inherited her stake in the multi-billion dollar family empire. She is not involved in the day-to-day management of the company and has maintained a life away from the public spotlight.